Atlas Air Compressor manual

Instruction book 2920 1521 00 1 Atlas Copco Stationary Air Compressors Instruction book SF1 - SF2 - SF4 Skid -Tank-mounted SF6 - SF8 Twin SF6 - SF8 - SF11 - SF15 Multi Copyright 2003, Atlas Copco Airpower n. v, Antwerp, Belgium. Any unauthorized use or copying of the contents or any part thereof is prohibited. This appli es in particular to tradema[...]

Instruction book 2920 1521 00 2 This instruction book de scribes how to handle the machine s to ensure safe operation, optimum efficiency and long service life. Read this book before putting th e machine into operation to ensure correct handli ng, operation and proper maintenance from the beginning. T he maintenan ce schedule comprise s measures fo[...]

Instruction book 2920 1521 00 3 1 LEADING P ARTICULARS.......................................................................................................... ......... 5 1.1 General de scription ........................................................................................................ ................ 5 1.1.1 Compress or vari ants [...]

Instruction book 2920 1521 00 4 7.16 SF6-15 Multi 145 psi 60 Hz 1) ............................................................................................ ...... 40 8 REGULATOR FUNCTION S FOR SF MULTI .................................................................................... 41 8.1 Menu-driven co ntrol programs ......................[...]

Instruction book 2920 1521 00 5 1 LEADING PARTICULARS 1.1 General description SF1 up to SF15 are stationary, oil-free comp ressors driven by an electri c motor. 1.1.1 Compressor variants SF Skid (Fig. 1.2) The components of the compressor are housed in a bodywork with removable front/top panel. The compressor is mounted on a frame de signed to allo[...]

Instruction book 2920 1521 00 6 1 Control panel 2 Air outlet valve Fig. 1.2 SF4 Skid 1 Control panel 2 Air outlet valve 1.3 SF4 Tank-mounted[...]

Instruction book 2920 1521 00 7 1 Control panels 2 Air outlet valve Fig. 1.4 SF Twin 1 Elektronikon regulator 2 Electric cabinet 3 Air outlet valve 4 Dryer (on Full-Featu re) 5 Compressor modules S3 Emergency stop button Fig. 1.5 SF8FF Multi[...]

Instruction book 2920 1521 00 8 1 Elektronikon regulator 2 Electric cabinet 3 Air outlet valve 4 Dryer (on Full-Featu re) 5 Compressor modules 6 Safety valve (ASME) S3 Emergency stop button Fig. 1.6 SF15FF Multi 1 Air filter 2 Compressor element 3 Air cooler 4 Belts 5 Safety valve 6 Drive motor 7 Safety valve Fig. 1.7 Details of a compressor modul [...]

Instruction book 2920 1521 00 9 1 Air filter 2 Drive motor 3 Compressor element 4 Compressed air outlet 5 Safety valve (CE) Fig. 1.8 Details of a compressor modul e on SF Multi 1.2 Air flow Air is drawn through the air filter into the comp re ssor modules and is com pressed. Compressed air is discharged through the che ck valve and air cooler towar[...]

Instruction book 2920 1521 00 10 1.4 Regulating system on SF Skid - Tank-mounted - Twin The air net pressure is kept within limits by a pres su re switch mounted in the cabi net below the control panel (Fig. 1.10). The swi tch is connected to the air outlet and electrically conn ected in the circuit of the drive motor. The switch opens and close s [...]

Instruction book 2920 1521 00 11 1.5 Regulating system on SF Multi SF Multi are provided with an Elektronikon® re gulator (Fig. 1.11) to control the compressor. The following is a short description of the main functions of the reg ulator. Consult section 8 for a detailed description of all functions. 1.5.1 Controlling the compressor The Elektronik[...]

Instruction book 2920 1521 00 12 Fig. 1.11 Elektronikon regulator on SF Multi 1.5.5 Control panel (Fig. 1.11) To control the compressor and to read and m odify progra mmable para meters, the regulator is p rovided with a control panel including: Ref Designation Function 1 Start button Push button to start the compressor. LE D (8) lights up indicati[...]

Instruction book 2920 1521 00 13 1.5.6 Display – keys Compressor Outlet 7.0 bar Compressor Running ↓ Menu - - - - F1 F2 F3 Fig. 1.12 Typical example of a display Operating condition of a compressor module The symbols shown above key F3 indicate the opera ting condition of each control module, see also se ction 8.1.2: Symbol Indicates - that the[...]

Instruction book 2920 1521 00 14 Designation Function Menu Starting from the main screen, to have access to submenus Menu Starting from a submenu, to return to a previous menu Modify To modify programmable settings Program To program modified settings Reset To reset a timer or message Return To return to a previously shown option or menu Selecting [...]

Instruction book 2920 1521 00 15 1.6 Electric cabinet on SF Multi F1/8 Fuses K11 Auxiliary contactor, dryer K21/24 Contactors Q21/24 Circuit breakers T1/2 Transformers 1X0 Terminal strip, mains suppl y 1X2 Terminal strip, dryer 1X3/6 Terminal strips Fig. 1.14 Electric cabinets, SF Multi[...]

Instruction book 2920 1521 00 16 1.7 Air dryer on SF Full-Feature (Fig. 1.15) Compressed air circuit Wet compressed air enters heat exchan ger (13) and is co oled by the outgoing, cold, dried ai r. Water in the incoming air starts to cond ense. The air then flow s through heat exchanger (1 1) where the refrigerant evaporates and withdraws heat from[...]

Instruction book 2920 1521 00 17 2 INSTALLATION 2.1 Dimension drawings (Figs. 2.1 up to 2.5) 9820 4052 00/1 55100D (1) (2) (3) (4) (5) (6) (7) (8) Fig. 2.1 Dimension drawing, SF 1-4 Skid 9820 4053 00/1 55101D (1) (2) (3) (4) (5) (6) (7) (8) Fig. 2.2 Dimension drawing, SF 1-4 Tank-mounted[...]

Instruction book 2920 1521 00 18 9820 4054 00/1 55102D (1) (2) (2) (1) (3) (4) (5) (6) (7) (8) Fig. 2.3 Dimension drawing, SF 6-8 Twin Text on Figs.2.1/2.3 1 Motor cooling air outlet 5 Electrical supply 2 Element cooling outlet 6 Type 3 Cooling air inlet 7 Pressure 4 Compressed air outlet 8 Mass, approx.[...]

Instruction book 2920 1521 00 19 (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (8) (9) (12) (13) (14) (15) 9820 4027 00 55098D Fig. 2.4 Dimension drawing, SF 6-8 Multi[...]

Instruction book 2920 1521 00 20 9820 4026 00 55099D (1) (16) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (8) (9) (12) (13) (14) (15) Fig. 2.5 Dimension drawing, SF 11-15 Multi[...]

Instruction book 2920 1521 00 21 Text on Figs. 2.4/2.5 (1) Electric cable (2) Manual drain (3) Automatic drain (4) Compressor cooling air ou tlet (5) Bodywork ventilation (6) Aftercooler and dryer cooling air outlet (7) Centre of gravity (8) With dryer (9) Without dryer (10) Dimensions +/- 10 mm (11) Weight (12) Weight +/- 10 kg (13) Compressor and[...]

Instruction book 2920 1521 00 22 2.2 Installation proposal (Fig. 2.6) 9820 3960 00 55097D (3) (1) (2) Fig. 2.6 Installation proposal, SF Multi Text on Figs. 2.6 (1) Minimum free area (2) Compressor (3) Ventilation proposals[...]

Instruction book 2920 1521 00 23 1 Install the compressor on a level floor, in a c ool but frost-free room which is well -ventilated. The air should be clean. 2 Position of compressed air outlet valve. 3 The maximum total pipe length can be calculated as follows: L = (dP x d 5 x P) / (450 x Qc 1.85 ) L = pipe len gth in m dP = maximum all owable pr[...]

Instruction book 2920 1521 00 24 2.3 Electrical connections General The electrical installation must correspon d to the local codes. The mains sup ply and earthing lines must be of suitable size. See section 7. 1. The installation must be earthed and protected by fu se s in each phase. An isolating switch must be installed near the compressor. Make[...]

Instruction book 2920 1521 00 25 SF Multi Connect the supply cable to terminals L 1, L2 and L3 of terminal strip (1X0-Fig. 1.14), co nnect the neutral conductor to terminal (N) and the earthing conductor to the earthin g bolt (1X3). O - O - O - O - O - - - 9820 3748 01/2 55105D (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13) (14) (15) (16) [...]

Instruction book 2920 1521 00 26 A1 Dryer (optional) F1/11 Fuses K11 Auxiliary contactor, dryer K21/24 Contactors M1/4 Motors M5 Fan motor, air cooler M6 Fan motor, bodywork PT20 Pressure sensor, air outlet Q21/24 Circuit breakers S3 Emergency stop button TSHH20 Temperature switch, air out let protection TT11 Temperature sensor, compressor element [...]

Instruction book 2920 1521 00 27 2.4 Pictographs Fig. 2.9 shows examples of pictograph s which may be used on the machine. 1 Automatic condensate drain 2 Manual condensate drain 3 Switch off voltage and depressurize co mpressor before maintenance or repair 4 Before connecting compressor electri cally, consult Instruction book for motor rotation dir[...]

Instruction book 2920 1521 00 28 3 OPERATING INSTRUCTIONS Safety precautions The operator must apply all relevant safety precautio ns, including those mentioned in this boo k. Outdoor/altitude operation If the compressor is installed outdoors o r if the air inlet temperature can be below 0 °C, p recautions must be taken. In this case, and also if [...]

Instruction book 2920 1521 00 29 3.3 During operation 3.3.1 Multi 1. If the automatic operation LED (8-Fig. 1.11) is alight, the regulator is aut omatically controlling the compressor modules (starting/stopping). 2. Check the readings on di splay (2-Fig. 1.11). In case of a warning or shut-down condition, see section 8.3. 3. Check that condensate i[...]

Instruction book 2920 1521 00 30 4 MAINTENANCE Before carrying out any maintenance or repair: 1. Stop the compressor, switch off t he voltage and open the isolating switch. 2. Close the air outlet valve (2-Figs. 1.2/1.4 or 3-Figs. 1. 5/1.6) and o pen the manual drain valve: valve (1- Fig. 1.9) on Multi or the valve undernea th the air receiver, if [...]

Instruction book 2920 1521 00 31 Period Running hours Service Plan See section See notes below table Operation Daily -- -- 3.4 -- Drain condensate " -- -- -- -- On SF Full-Feature, check dewpoint Monthly 250 -- 5.1 1 Inspect air filter 3-monthly 500 -- -- -- Check pressure drop over Atlas Copco filters (optional) 6-monthly -- -- 5.4 -- Operate[...]

Instruction book 2920 1521 00 32 5 ADJUSTMENTS AND SERVICING PROCEDURES 5.1 Air filter (1-Figs. 1.7/1.8) 1. Stop the compressor. Remove the filter cover and fil ter. 2. Clean the cover, if necessa ry. Discard damaged filters. 3. Fit a new filter and reinstall the cover. 5.2 Belt exchange/tensioning (Fig. 5.1) In case of two belts, the belts must be[...]

Instruction book 2920 1521 00 33 5.4 Safety valve Operating Operate the safety valve by unscrewing the knurle d cap one or two turn s. Retighten the cap. Testing The valve can be tested on a separate comp ressed ai r line. If the valve does not open at the pressure marked on the valve, consult Atlas Copco. Warning No adjustments are allowed. Never [...]

Instruction book 2920 1521 00 34 6 PROBLEM SOLVING Before carrying out any maintenance or repair: 1. Stop the compressor, switch off t he voltage and open the isolating switch. 2. Close the air outlet valve (2-Figs. 1.2/1.4 or 3- Figs. 1.5/1.6) and o pen the manual drain valve: valve (1-Fig. 1.9) on Multi or the valve undern eath the air receiver, [...]

Instruction book 2920 1521 00 35 7 PRINCIPAL DATA 7.1 Electric cable size for SF1-8 Frequency Voltage SF1 single- phase SF2 single- phase SF2 3-phase SF4 3-phase SF6 3-phase SF8 3-phase IEC 50 Hz 230 V 2.5 mm² 2.5 mm² 2.5 mm² 2.5 mm² 2x 2.5 mm² 2x 2.5 mm² 50 Hz 400 V 2.5 mm² 2.5 mm² 2x 2.5 mm² 2x 2.5 mm² 60 Hz 380 V 2.5 mm² 2.5 mm² 2x 2[...]

Instruction book 2920 1521 00 36 7.3 Overload relays for SF1-8 Frequency Voltage SF1 single- phase SF2 single- phase SF2 3-phase SF4 3-phase SF6 3-phase SF8 3-phase IEC 50 Hz 230 V 12 A 14.5 A 8.3 A 14 A 8.3 and 14 A 2x 14 A 50 Hz 400 V 4.8 A 8.2 A 4.8 and 8.2 A 2x 8.2 A 60 Hz 380 V 5.1 A 8.5 A 5.1 and 8.5 A 2x 8.5 A 50 Hz 500 V 3.8 A 6.5 A 3.8 and[...]

Instruction book 2920 1521 00 37 7.5 Main fuses for SF1-8 Frequency Voltage SF1 single- phase SF2 single- phase SF2 3-phase SF4 3-phase SF6 3-phase SF8 3-phase IEC 50 Hz 230 V 20 A 20 A 20 A 20 A 2x 20 A 2x 20 A 50 Hz 400 V 20 A 20 A 2x 20 A 2x 20 A 60 Hz 380 V 20 A 20 A 2x 20 A 2x 20 A 50 Hz 500 V 20 A 20 A 2x 20 A 2x 20 A CSA/UL 60 Hz 230 V 25 A [...]

Instruction book 2920 1521 00 38 7.8 SF1-4 8bar 50 Hz 1) Compressor type SF1 SF2 SF4 8 bar 8 bar 8 bar Maximum working pressure bar(e) 8 8 8 Nominal working pressu re bar(e) 7 7 7 Air temperature at outlet valve (Tank- mounted/Twin), approx. °C 30 32 40 Air temperature at outlet valve (Skid), approx. °C 38 45 65 Motor shaft speed r/min 2885 2885 [...]

Instruction book 2920 1521 00 39 7.12 SF6-15 Multi 8 bar 50 Hz 1) Compressor type SF6 SF8 SF11 SF15 8 bar 8 bar 8 bar 8 bar Maximum working pressure for SF Pack bar(e) 8 8 8 8 Maximum working pressure for SF Full-Feature bar(e) 7 .75 7.75 7.75 7.75 Nominal working pressu re bar(e) 7 7 7 7 Air temperature at outlet valve for SF Pack, approx. °C 26 [...]

Instruction book 2920 1521 00 40 7.15 SF6-15 Multi 125 psi 60 Hz 1) Compressor type SF6 SF8 SF11 SF15 125 psi 125 psi 125 psi 125 psi Maximum working pressure for SF Pack bar(e) 9.1 9.1 9.1 9.1 Maximum working pressure for SF Full-Feature bar(e) 8.85 8.85 8.85 8.85 Nominal working pressu re bar(e) 8.6 8.6 8.6 8.6 Air temperature at outlet valve for[...]

Instruction book 2920 1521 00 41 8 REGULATOR FUNCTIONS FOR SF MULTI 8.1 Menu-driven control programs To facilitate programming and controlli ng the comp ressor, menu-d riven progr ams are implemented in the electronic module. A simplified menu flow is shown in Fig. 8.1. Fig. 8.1 Menu flow SF15 Workplace Full-Feature[...]

Instruction book 2920 1521 00 42 8.1.1 Function of control programs Program/Function Description Main screen Shows in short t he operation status of the comp ressor. It is the gateway to all functions. See Fig. 8.2. Status data Calling up the status of t he compressor protection functions: - shut-down - servi ce warning - warning Resetting of a shu[...]

Instruction book 2920 1521 00 43 Line Indicates Remarks 1 Sensor which is active and the actual reading The unit for pressure can be bar, p si or kg/cm 2 dependi ng on the programmed selection. T he unit for temperature can be ° C or °F. See section 8.12. 2 - - 3 Compressor status Examples: - Compressor Off - Compressor Running 3 Shut-down If the[...]

Instruction book 2920 1521 00 44 8.1.3 Calling up other menus Starting from the Main screen: - Use the ↓ key for a quick look at the actual compressor statu s (see section 8.2) - Press the key "Menu" (F1), the option "Status data" will be followed by a horizontal arrow: - either press the tabulato r key (5) to select this menu[...]

Instruction book 2920 1521 00 45 8.3 Status data menu The status data submenu gives info rmation regar ding the status of the compresso r protection functions (shut-down, serv ice warning and warni ng) and allows resetting of a shut-do wn and service condition. Procedure Starting from the Main screen (see section 8.1.2): - Press the key "Menu&[...]

Instruction book 2920 1521 00 46 2. It remains possi ble to scroll through other menus, e.g. to che ck the values of other parame ters. When returning to the Status data menu, the opt ion "Shutdowns" will blink. This option can be selected by pressing the tabulator key (5) to return to the shut-do wn screen (Fig. 8.6). Shut-do wn reset 1.[...]

Instruction book 2920 1521 00 47 8.3.4 A service warning message exists 1. LED (7) is alight and the main scre en will change in to a screen similar to that sho wn in Fig. 8.9. Compressor Outlet 7.0 bar ** Service Required ** ↓ Menu *** *** - - - - F1 F2 F3 Fig. 8.9 Example of a service warning screen 2. The indicators (***) are bli nking and the[...]

Instruction book 2920 1521 00 48 2. By pressing the ↓ key, a number of actually measure d data can be found (see Fig. 8.1). 3. If one of the sensors i s linked to a shut-do wn, service or warning fu nction, both the actually measured value as well as the corresponding shut-d own, warning or service level can be called up by pressing the tabulator[...]

Instruction book 2920 1521 00 49 8.7 Modify parameters menu Function The menu allows the operator to progra m: - Parameters, see section 8 .8. - Protections settings, see section 8.9. - Service plan settings, see section 8.10. - Clock fun ction sett ings, see se ction 8.11. - Configuration settings, see section 8.12. 8.8 Modifying parameters Functi[...]

Instruction book 2920 1521 00 50 8.8.1 Modifying the pressure bands If desired, the operator ca n program two pressure bands (band 1 and band 2) with different pres sure settings. The settings for band 1 are indicated as "Pressu re Band 1 High" and "Pre ssure Band 1 Low", the settings for band 2 are indi cated as " Pr essur[...]

Instruction book 2920 1521 00 51 8.9 Modifying protection settings Function 1. To modify protection settings: warning (" Warning" ), e. g. Dryer LAT (Lo w Ambient Temperature) o n Full-Feature machines 2. To check some compressor conditions, e.g. the status of the motor overl oad contacts per compressor module. The list of param eters is [...]

Instruction book 2920 1521 00 52 8.9.2 Modifying protections for Dryer LAT on Full-Fea ture machines 1. Consult the section above to select the par ameter Dryer LAT (Lo w Ambient Temperature): Dryer LAT 10 °C → Warning Maximum 25 °C ↓ Back Modify F1 F2 F3 Fig. 8.14 Modify parameters menu 2. The screen shows that the Dryer LAT is 10 °C an d t[...]

Instruction book 2920 1521 00 53 Important Always consult Atlas Copco i n case any timer setting should be chang ed. The intervals must not exceed the periods below and must coincide logi cally. Programmed service plan intervals Service plans Intervals Service plan I Each 2500 running hours Service plan A Each 5000 running hours Service plan B Each[...]

Instruction book 2920 1521 00 54 4. Press the tabulator key (5): a screen sim ilar to the one below will appear: Service Timer Level A 5000 hrs ↓ Menu Modify F1 F2 F3 Fig. 8.17 Service plan menu 5. The screen indicates that the level for Service plan A is set at 5000 running hours. 6. Press the "Modify" key. The key "Limits" ([...]

Instruction book 2920 1521 00 55 3. Press the tabulator key (5), following screen ap pears: Monday → Tuesday Wednes day ↓ Back Delete F1 F2 F3 4. Use the ↓ or ↑ key until the day on which a comman d must be programmed is followed by a right pointing arrow. Press the tabulator key (5), following screen app ears: --:-- -------- -------- -----[...]

Instruction book 2920 1521 00 56 8.11.2 To activate/deactivate the timer 1. Starting from the Main screen (see section 8.1.2): - press the key "Menu" (F1) - press the ↓ key until the option "Modify para meters" is followed by a horizontal arrow - press the tabulator key (5) to activate the menu 2. Use the ↓ key to scroll unt[...]

Instruction book 2920 1521 00 57 2. Use the ↓ key to scroll until the optio n "Clock function" is followe d by a horizont al arrow. Press the tabulator key (5), following screen app ears: Clock Functio n Not activated → Menu Modify Delete F1 F2 F3 3. Press the tabulator key (5), following screen ap pears: Monday → Tuesday Wednes day[...]

Instruction book 2920 1521 00 58 Suppose the command to stop the com pressor at 18:00 must be added to the li st of Monday: - 06:15 start - 06:15 pressure band 1 3. Press the tabulator key (5), following screen ap pears: Monday → Tuesday Wednes day ↓ Menu Delete F1 F2 F3 4. Scroll through the display until "Monday " is followed by a h[...]

Instruction book 2920 1521 00 59 2. Use the ↓ key to scroll until the optio n "Clock function" is followe d by a horizont al arrow. Press the tabulator key (5), following screen app ears: Clock Functio n Not activated → Menu Modify Delete F1 F2 F3 Deleting all commands Press the key "Delete" (F3) in the screen above. A quest[...]

Instruction book 2920 1521 00 60 5. If it is desired to modify the time, press the key "Modify ". If not, press the key "Menu" to return to the submenu. 6. After pressing the key "Modify", the first fiel d (14) will blink. M odi fy the hours using the ↓ or ↑ keys. Then press the tabulator key (5) to go to the next [...]

Instruction book 2920 1521 00 61 Service plans - Contact your Atlas Copco cu stomer centre fo r the service actions related to these plan s. - Consult section 8.10 if any modificati on to the intervals should be required. When the service plan interval is reached, a mess age will appear o n the screen. See section 8.3. Example Programmed service pl[...]

Instruction book 2920 1521 00 62 3. Press the tabulator key (5): Next Timer Level ABI 10000 hrs ↓ Back Reset F1 F2 F3 Fig. 8.20 Service menu, typical example The screen shows that the next se rvice plans to be carried out ar e pla ns A, B and I and that these plans are to be carried out each 10000 runnin g hours. 4. Press the ↓ key to find whic[...]

Instruction book 2920 1521 00 63 8.14 Saved data menu Function To call up some compressor data saved by the regulator. These data are: - Last shut-down data - Last emergency stop data Procedure 1. Starting from the Main screen (see section 8.1.2): - press the key "Menu" (F1) - press the ↓ key until the option "Saved data" is f[...]

Instruction book 2920 1521 00 64 8.15 Programmable settings 8.15.1 Regulation settings Minimum setting Nominal setting Maximum setting Number of motor starts starts/day 240 720 720 Minimum stop time 1) sec 5 5 30 Stop between 2 compresso r modules sec 2 2 5 Start between 2 compressor modules sec 2 2 10 Power recovery time 3) sec 10 10 3600 Delay at[...]

Instruction book 2920 1521 00 65 8.15.2 Service setti ngs Minimum setting Nominal setting Maximum setting Service Plan I hr 2000 2500 2500 Service Plan A hr 4000 5000 5000 Service Plan B hr 8000 10000 10000 Service Plan D hr 1600 0 20000 20000 Footnotes chapter 8 1) Once the compressor module i s automatically stopped, it will remain stoppe d for t[...]

Product: SF1-4 Skid and Tank-M ounted SF6-8 Twin SF6-15 Multi Instructions for use of air receiver 1 This vessel can contain pressuri zed air; be wa re of its potential danger in case of misuse. 2 The vessel shall only be used to store compressed ai r and shall not be subject to rapid fluctuation of pressure. 3 This vessel shall only be used within[...]

Instruction book 2920 1521 00 67 Notes:[...]

Instruction book 2920 1521 00 68 Notes:[...]

Compressor type: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Unit serial No. compressor: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Air dryer type: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Unit serial No. dryer: . . . . . . . . . . . . . . . [...]

1 4 . If the ground is not level or can be subject to variable inclination, consult Atlas Copco. 1 5 . The electrical connections shall correspond to the local codes. T h e units shall be grounded and protected against short circuits by fuses. Operation 1 . Air hoses shall be of correct size and suitable for the working pressure. Never use frayed, [...]